2. Measurement methods and principles
A tile-shaped acoustic sensor is placed on the fuel rod at plenum level (figure
4
). It must be small enough to pass between the fuel rods, and must operate in the presence of water, as the measurements are taken in the pool. When the assemblies are unloaded, the reactor vessel is flooded (figure
1
) and all the assemblies are transferred to the fuel building pool (figure
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Measurement methods and principles